γ, γ-ジアルコキシアリルジルコニウム種を用いた炭素-炭素結合形成反応の開発 Development of Carbon-Carbon Bond-Forming Reactions using γ, γ-Dialkoxyallylic Zirconium Species

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Carbon-carbon bond-forming reactions of allylic organometals have been recognized as one of the most fundamental means in organic synthesis, and a number of applications for the synthesis of biologically active molecules have been reported. We have reported the carbon-carbon bond-forming reactions by the use of the allylic and related zirconium species as reactive intermediates. These zirconium species can be generated by treating allylic ethers with zirconocene-butene complex ("Cp<SUB>2</SUB>Zr") through the formation of zirconacyclopropane and the following β-elimination of the alkoxy group. This process was found to be applicable to generate the γ, γ-dialkoxyallylic zirconium species 1 from orthoacrylate derivative. Zirconium species 1 possibly has three reactive sites : One is the γ-position as a typical allyl metal species, the other is the β-position followed by the α-position initiated by nucleophilic character of ketene dialkylacetal moiety and the third one is regioselective coupling reaction at the α-position.<BR>Thus, γ, γ-dialkoxyallylic zirconium species 1 can be conveniently prepared by the reaction of triethyl orthoacrylate with "Cp<SUB>2</SUB>Zr". Without an additive, 1 itself reacts with aldehydes and ketones at the γ-position to afford the <I>gem</I>-diethoxy homoallylic alcohol derivatives. Under Lewis acid promoted conditions, this zirconium species 1 reacts with a variety of carbonyl compounds selectively at the β-position in the first step, followed by the cyclopropanation or cyclobutanation reaction to afford the corresponding products mainly depending on electronic nature of substrates or reaction conditions. In the presence of CuCN, reaction of 1 with allylic phosphates proceeded at the α-position of 1 in a highly S<SUB>N</SUB>2'-selective manner to give the 5-alkenoates.

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  • 有機合成化学協会誌 : JOURNAL OF Synthetic Organic Chemistry JAPAN

    有機合成化学協会誌 : JOURNAL OF Synthetic Organic Chemistry JAPAN 65(1), 54-64, 2007-01-01

    The Society of Synthetic Organic Chemistry, Japan

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